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2208/天天乐学考试答案/MySQL练习（一）.md

@@ -222,6 +222,22 @@ SET a.avatar = LOAD_FILE('C:/TTLXExam/20501071168/MYSQLDB/3/jinyong.jpg')
 WHERE a.author_name = '金庸';
 
 #6
+#INSTR(主串, 子串) 判断子串在主串中的位置并返回
+#SUBSTR(字符串, 起始位置) 从起始位置开始截取字符串
+SELECT SUBSTR(b.note,INSTR(b.note,'-')+2)
+FROM tb_books b;
 
+UPDATE tb_books b
+SET b.note = SUBSTR(b.note,INSTR(b.note,'-')+2);
+
+#7
+SELECT b.book_id, b.title, 
+FROM tb_books b
+WHERE YEAR(b.publication_date) BETWEEN 1980 AND 2010
+ORDER BY
+
+#8
+
+#9
 ```